/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
* Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "core/page/EventHandler.h"
#include "bindings/v8/ExceptionStatePlaceholder.h"
#include "core/HTMLNames.h"
#include "core/SVGNames.h"
#include "core/clipboard/Clipboard.h"
#include "core/clipboard/DataObject.h"
#include "core/dom/Document.h"
#include "core/dom/DocumentMarkerController.h"
#include "core/dom/FullscreenElementStack.h"
#include "core/dom/NodeRenderingTraversal.h"
#include "core/dom/TouchList.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/editing/Editor.h"
#include "core/editing/FrameSelection.h"
#include "core/editing/TextIterator.h"
#include "core/editing/htmlediting.h"
#include "core/events/DOMWindowEventQueue.h"
#include "core/events/EventPath.h"
#include "core/events/KeyboardEvent.h"
#include "core/events/MouseEvent.h"
#include "core/events/TextEvent.h"
#include "core/events/TouchEvent.h"
#include "core/events/WheelEvent.h"
#include "core/fetch/ImageResource.h"
#include "core/frame/FrameView.h"
#include "core/frame/LocalFrame.h"
#include "core/html/HTMLDialogElement.h"
#include "core/html/HTMLFrameElementBase.h"
#include "core/html/HTMLFrameSetElement.h"
#include "core/html/HTMLInputElement.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderClient.h"
#include "core/page/AutoscrollController.h"
#include "core/page/BackForwardClient.h"
#include "core/page/Chrome.h"
#include "core/page/ChromeClient.h"
#include "core/page/DragController.h"
#include "core/page/DragState.h"
#include "core/page/EditorClient.h"
#include "core/page/FocusController.h"
#include "core/page/FrameTree.h"
#include "core/inspector/InspectorController.h"
#include "core/page/MouseEventWithHitTestResults.h"
#include "core/page/Page.h"
#include "core/frame/Settings.h"
#include "core/page/SpatialNavigation.h"
#include "core/page/TouchAdjustment.h"
#include "core/rendering/HitTestRequest.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/RenderFlowThread.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderTextControlSingleLine.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/RenderWidget.h"
#include "core/rendering/style/RenderStyle.h"
#include "core/svg/SVGDocumentExtensions.h"
#include "platform/PlatformGestureEvent.h"
#include "platform/PlatformKeyboardEvent.h"
#include "platform/PlatformTouchEvent.h"
#include "platform/PlatformWheelEvent.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/TraceEvent.h"
#include "platform/WindowsKeyboardCodes.h"
#include "platform/geometry/FloatPoint.h"
#include "platform/graphics/Image.h"
#include "platform/heap/Handle.h"
#include "platform/scroll/ScrollAnimator.h"
#include "platform/scroll/Scrollbar.h"
#include "wtf/Assertions.h"
#include "wtf/CurrentTime.h"
#include "wtf/StdLibExtras.h"
#include "wtf/TemporaryChange.h"
namespace WebCore {
using namespace HTMLNames;
// The link drag hysteresis is much larger than the others because there
// needs to be enough space to cancel the link press without starting a link drag,
// and because dragging links is rare.
static const int LinkDragHysteresis = 40;
static const int ImageDragHysteresis = 5;
static const int TextDragHysteresis = 3;
static const int GeneralDragHysteresis = 3;
// The amount of time to wait before sending a fake mouse event, triggered
// during a scroll. The short interval is used if the content responds to the mouse events quickly enough,
// otherwise the long interval is used.
static const double fakeMouseMoveShortInterval = 0.1;
static const double fakeMouseMoveLongInterval = 0.250;
// The amount of time to wait for a cursor update on style and layout changes
// Set to 50Hz, no need to be faster than common screen refresh rate
static const double cursorUpdateInterval = 0.02;
static const int maximumCursorSize = 128;
// It's pretty unlikely that a scale of less than one would ever be used. But all we really
// need to ensure here is that the scale isn't so small that integer overflow can occur when
// dividing cursor sizes (limited above) by the scale.
static const double minimumCursorScale = 0.001;
// The minimum amount of time an element stays active after a ShowPress
// This is roughly 9 frames, which should be long enough to be noticeable.
static const double minimumActiveInterval = 0.15;
#if OS(MACOSX)
static const double TextDragDelay = 0.15;
#else
static const double TextDragDelay = 0.0;
#endif
enum NoCursorChangeType { NoCursorChange };
class OptionalCursor {
public:
OptionalCursor(NoCursorChangeType) : m_isCursorChange(false) { }
OptionalCursor(const Cursor& cursor) : m_isCursorChange(true), m_cursor(cursor) { }
bool isCursorChange() const { return m_isCursorChange; }
const Cursor& cursor() const { ASSERT(m_isCursorChange); return m_cursor; }
private:
bool m_isCursorChange;
Cursor m_cursor;
};
class MaximumDurationTracker {
public:
explicit MaximumDurationTracker(double *maxDuration)
: m_maxDuration(maxDuration)
, m_start(monotonicallyIncreasingTime())
{
}
~MaximumDurationTracker()
{
*m_maxDuration = max(*m_maxDuration, monotonicallyIncreasingTime() - m_start);
}
private:
double* m_maxDuration;
double m_start;
};
static inline ScrollGranularity wheelGranularityToScrollGranularity(unsigned deltaMode)
{
switch (deltaMode) {
case WheelEvent::DOM_DELTA_PAGE:
return ScrollByPage;
case WheelEvent::DOM_DELTA_LINE:
return ScrollByLine;
case WheelEvent::DOM_DELTA_PIXEL:
return ScrollByPixel;
default:
return ScrollByPixel;
}
}
// Refetch the event target node if it is removed or currently is the shadow node inside an element.
// If a mouse event handler changes the input element type to one that has a widget associated,
// we'd like to EventHandler::handleMousePressEvent to pass the event to the widget and thus the
// event target node can't still be the shadow node.
static inline bool shouldRefetchEventTarget(const MouseEventWithHitTestResults& mev)
{
Node* targetNode = mev.targetNode();
if (!targetNode || !targetNode->parentNode())
return true;
return targetNode->isShadowRoot() && isHTMLInputElement(*toShadowRoot(targetNode)->host());
}
EventHandler::EventHandler(LocalFrame* frame)
: m_frame(frame)
, m_mousePressed(false)
, m_capturesDragging(false)
, m_mouseDownMayStartSelect(false)
, m_mouseDownMayStartDrag(false)
, m_mouseDownWasSingleClickInSelection(false)
, m_selectionInitiationState(HaveNotStartedSelection)
, m_hoverTimer(this, &EventHandler::hoverTimerFired)
, m_cursorUpdateTimer(this, &EventHandler::cursorUpdateTimerFired)
, m_mouseDownMayStartAutoscroll(false)
, m_mouseDownWasInSubframe(false)
, m_fakeMouseMoveEventTimer(this, &EventHandler::fakeMouseMoveEventTimerFired)
, m_svgPan(false)
, m_resizeScrollableArea(0)
, m_eventHandlerWillResetCapturingMouseEventsNode(0)
, m_clickCount(0)
, m_shouldOnlyFireDragOverEvent(false)
, m_mousePositionIsUnknown(true)
, m_mouseDownTimestamp(0)
, m_widgetIsLatched(false)
, m_touchPressed(false)
, m_scrollGestureHandlingNode(nullptr)
, m_lastHitTestResultOverWidget(false)
, m_maxMouseMovedDuration(0)
, m_baseEventType(PlatformEvent::NoType)
, m_didStartDrag(false)
, m_longTapShouldInvokeContextMenu(false)
, m_activeIntervalTimer(this, &EventHandler::activeIntervalTimerFired)
, m_lastShowPressTimestamp(0)
{
}
EventHandler::~EventHandler()
{
ASSERT(!m_fakeMouseMoveEventTimer.isActive());
}
void EventHandler::trace(Visitor* visitor)
{
visitor->trace(m_mousePressNode);
visitor->trace(m_capturingMouseEventsNode);
visitor->trace(m_nodeUnderMouse);
visitor->trace(m_lastNodeUnderMouse);
visitor->trace(m_clickNode);
visitor->trace(m_dragTarget);
visitor->trace(m_frameSetBeingResized);
visitor->trace(m_latchedWheelEventNode);
visitor->trace(m_previousWheelScrolledNode);
visitor->trace(m_targetForTouchID);
visitor->trace(m_touchSequenceDocument);
visitor->trace(m_scrollGestureHandlingNode);
visitor->trace(m_previousGestureScrolledNode);
visitor->trace(m_lastDeferredTapElement);
}
DragState& EventHandler::dragState()
{
#if ENABLE(OILPAN)
DEFINE_STATIC_LOCAL(Persistent, state, (new DragState()));
return *state;
#else
DEFINE_STATIC_LOCAL(DragState, state, ());
return state;
#endif
}
void EventHandler::clear()
{
m_hoverTimer.stop();
m_cursorUpdateTimer.stop();
m_fakeMouseMoveEventTimer.stop();
m_activeIntervalTimer.stop();
m_resizeScrollableArea = 0;
m_nodeUnderMouse = nullptr;
m_lastNodeUnderMouse = nullptr;
m_lastMouseMoveEventSubframe = nullptr;
m_lastScrollbarUnderMouse = nullptr;
m_clickCount = 0;
m_clickNode = nullptr;
m_frameSetBeingResized = nullptr;
m_dragTarget = nullptr;
m_shouldOnlyFireDragOverEvent = false;
m_mousePositionIsUnknown = true;
m_lastKnownMousePosition = IntPoint();
m_lastKnownMouseGlobalPosition = IntPoint();
m_lastMouseDownUserGestureToken.clear();
m_mousePressNode = nullptr;
m_mousePressed = false;
m_capturesDragging = false;
m_capturingMouseEventsNode = nullptr;
m_latchedWheelEventNode = nullptr;
m_previousWheelScrolledNode = nullptr;
m_targetForTouchID.clear();
m_touchSequenceDocument.clear();
m_touchSequenceUserGestureToken.clear();
m_scrollGestureHandlingNode = nullptr;
m_lastHitTestResultOverWidget = false;
m_previousGestureScrolledNode = nullptr;
m_scrollbarHandlingScrollGesture = nullptr;
m_maxMouseMovedDuration = 0;
m_baseEventType = PlatformEvent::NoType;
m_didStartDrag = false;
m_touchPressed = false;
m_mouseDownMayStartSelect = false;
m_mouseDownMayStartDrag = false;
m_lastShowPressTimestamp = 0;
m_lastDeferredTapElement = nullptr;
}
void EventHandler::nodeWillBeRemoved(Node& nodeToBeRemoved)
{
if (!nodeToBeRemoved.containsIncludingShadowDOM(m_clickNode.get()))
return;
if (nodeToBeRemoved.isInShadowTree()) {
m_clickNode = nodeToBeRemoved.parentOrShadowHostNode();
} else {
// We don't dispatch click events if the mousedown node is removed
// before a mouseup event. It is compatible with IE and Firefox.
m_clickNode = nullptr;
}
}
static void setSelectionIfNeeded(FrameSelection& selection, const VisibleSelection& newSelection)
{
if (selection.selection() != newSelection)
selection.setSelection(newSelection);
}
static inline bool dispatchSelectStart(Node* node)
{
if (!node || !node->renderer())
return true;
return node->dispatchEvent(Event::createCancelableBubble(EventTypeNames::selectstart));
}
static VisibleSelection expandSelectionToRespectUserSelectAll(Node* targetNode, const VisibleSelection& selection)
{
Node* rootUserSelectAll = Position::rootUserSelectAllForNode(targetNode);
if (!rootUserSelectAll)
return selection;
VisibleSelection newSelection(selection);
newSelection.setBase(positionBeforeNode(rootUserSelectAll).upstream(CanCrossEditingBoundary));
newSelection.setExtent(positionAfterNode(rootUserSelectAll).downstream(CanCrossEditingBoundary));
return newSelection;
}
bool EventHandler::updateSelectionForMouseDownDispatchingSelectStart(Node* targetNode, const VisibleSelection& selection, TextGranularity granularity)
{
if (Position::nodeIsUserSelectNone(targetNode))
return false;
if (!dispatchSelectStart(targetNode))
return false;
if (selection.isRange())
m_selectionInitiationState = ExtendedSelection;
else {
granularity = CharacterGranularity;
m_selectionInitiationState = PlacedCaret;
}
m_frame->selection().setNonDirectionalSelectionIfNeeded(selection, granularity);
return true;
}
void EventHandler::selectClosestWordFromHitTestResult(const HitTestResult& result, AppendTrailingWhitespace appendTrailingWhitespace)
{
Node* innerNode = result.targetNode();
VisibleSelection newSelection;
if (innerNode && innerNode->renderer()) {
VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
if (pos.isNotNull()) {
newSelection = VisibleSelection(pos);
newSelection.expandUsingGranularity(WordGranularity);
}
if (appendTrailingWhitespace == ShouldAppendTrailingWhitespace && newSelection.isRange())
newSelection.appendTrailingWhitespace();
updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), WordGranularity);
}
}
void EventHandler::selectClosestMisspellingFromHitTestResult(const HitTestResult& result, AppendTrailingWhitespace appendTrailingWhitespace)
{
Node* innerNode = result.targetNode();
VisibleSelection newSelection;
if (innerNode && innerNode->renderer()) {
VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
Position start = pos.deepEquivalent();
Position end = pos.deepEquivalent();
if (pos.isNotNull()) {
WillBeHeapVector markers = innerNode->document().markers().markersInRange(makeRange(pos, pos).get(), DocumentMarker::MisspellingMarkers());
if (markers.size() == 1) {
start.moveToOffset(markers[0]->startOffset());
end.moveToOffset(markers[0]->endOffset());
newSelection = VisibleSelection(start, end);
}
}
if (appendTrailingWhitespace == ShouldAppendTrailingWhitespace && newSelection.isRange())
newSelection.appendTrailingWhitespace();
updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), WordGranularity);
}
}
void EventHandler::selectClosestWordFromMouseEvent(const MouseEventWithHitTestResults& result)
{
if (m_mouseDownMayStartSelect) {
selectClosestWordFromHitTestResult(result.hitTestResult(),
(result.event().clickCount() == 2 && m_frame->editor().isSelectTrailingWhitespaceEnabled()) ? ShouldAppendTrailingWhitespace : DontAppendTrailingWhitespace);
}
}
void EventHandler::selectClosestMisspellingFromMouseEvent(const MouseEventWithHitTestResults& result)
{
if (m_mouseDownMayStartSelect) {
selectClosestMisspellingFromHitTestResult(result.hitTestResult(),
(result.event().clickCount() == 2 && m_frame->editor().isSelectTrailingWhitespaceEnabled()) ? ShouldAppendTrailingWhitespace : DontAppendTrailingWhitespace);
}
}
void EventHandler::selectClosestWordOrLinkFromMouseEvent(const MouseEventWithHitTestResults& result)
{
if (!result.hitTestResult().isLiveLink())
return selectClosestWordFromMouseEvent(result);
Node* innerNode = result.targetNode();
if (innerNode && innerNode->renderer() && m_mouseDownMayStartSelect) {
VisibleSelection newSelection;
Element* URLElement = result.hitTestResult().URLElement();
VisiblePosition pos(innerNode->renderer()->positionForPoint(result.localPoint()));
if (pos.isNotNull() && pos.deepEquivalent().deprecatedNode()->isDescendantOf(URLElement))
newSelection = VisibleSelection::selectionFromContentsOfNode(URLElement);
updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), WordGranularity);
}
}
bool EventHandler::handleMousePressEventDoubleClick(const MouseEventWithHitTestResults& event)
{
TRACE_EVENT0("webkit", "EventHandler::handleMousePressEventDoubleClick");
if (event.event().button() != LeftButton)
return false;
if (m_frame->selection().isRange()) {
// A double-click when range is already selected
// should not change the selection. So, do not call
// selectClosestWordFromMouseEvent, but do set
// m_beganSelectingText to prevent handleMouseReleaseEvent
// from setting caret selection.
m_selectionInitiationState = ExtendedSelection;
} else {
selectClosestWordFromMouseEvent(event);
}
return true;
}
bool EventHandler::handleMousePressEventTripleClick(const MouseEventWithHitTestResults& event)
{
TRACE_EVENT0("webkit", "EventHandler::handleMousePressEventTripleClick");
if (event.event().button() != LeftButton)
return false;
Node* innerNode = event.targetNode();
if (!(innerNode && innerNode->renderer() && m_mouseDownMayStartSelect))
return false;
VisibleSelection newSelection;
VisiblePosition pos(innerNode->renderer()->positionForPoint(event.localPoint()));
if (pos.isNotNull()) {
newSelection = VisibleSelection(pos);
newSelection.expandUsingGranularity(ParagraphGranularity);
}
return updateSelectionForMouseDownDispatchingSelectStart(innerNode, expandSelectionToRespectUserSelectAll(innerNode, newSelection), ParagraphGranularity);
}
static int textDistance(const Position& start, const Position& end)
{
RefPtrWillBeRawPtr range = Range::create(*start.document(), start, end);
return TextIterator::rangeLength(range.get(), true);
}
bool EventHandler::handleMousePressEventSingleClick(const MouseEventWithHitTestResults& event)
{
TRACE_EVENT0("webkit", "EventHandler::handleMousePressEventSingleClick");
m_frame->document()->updateLayoutIgnorePendingStylesheets();
Node* innerNode = event.targetNode();
if (!(innerNode && innerNode->renderer() && m_mouseDownMayStartSelect))
return false;
// Extend the selection if the Shift key is down, unless the click is in a link.
bool extendSelection = event.event().shiftKey() && !event.isOverLink();
// Don't restart the selection when the mouse is pressed on an
// existing selection so we can allow for text dragging.
if (FrameView* view = m_frame->view()) {
LayoutPoint vPoint = view->windowToContents(event.event().position());
if (!extendSelection && m_frame->selection().contains(vPoint)) {
m_mouseDownWasSingleClickInSelection = true;
return false;
}
}
VisiblePosition visiblePos(innerNode->renderer()->positionForPoint(event.localPoint()));
if (visiblePos.isNull())
visiblePos = VisiblePosition(firstPositionInOrBeforeNode(innerNode), DOWNSTREAM);
Position pos = visiblePos.deepEquivalent();
VisibleSelection newSelection = m_frame->selection().selection();
TextGranularity granularity = CharacterGranularity;
if (extendSelection && newSelection.isCaretOrRange()) {
VisibleSelection selectionInUserSelectAll(expandSelectionToRespectUserSelectAll(innerNode, VisibleSelection(VisiblePosition(pos))));
if (selectionInUserSelectAll.isRange()) {
if (comparePositions(selectionInUserSelectAll.start(), newSelection.start()) < 0)
pos = selectionInUserSelectAll.start();
else if (comparePositions(newSelection.end(), selectionInUserSelectAll.end()) < 0)
pos = selectionInUserSelectAll.end();
}
if (!m_frame->editor().behavior().shouldConsiderSelectionAsDirectional()) {
if (pos.isNotNull()) {
// See REGRESSION (Mail): shift-click deselects when selection
// was created right-to-left
Position start = newSelection.start();
Position end = newSelection.end();
int distanceToStart = textDistance(start, pos);
int distanceToEnd = textDistance(pos, end);
if (distanceToStart <= distanceToEnd)
newSelection = VisibleSelection(end, pos);
else
newSelection = VisibleSelection(start, pos);
}
} else
newSelection.setExtent(pos);
if (m_frame->selection().granularity() != CharacterGranularity) {
granularity = m_frame->selection().granularity();
newSelection.expandUsingGranularity(m_frame->selection().granularity());
}
} else {
newSelection = expandSelectionToRespectUserSelectAll(innerNode, VisibleSelection(visiblePos));
}
// Updating the selection is considered side-effect of the event and so it doesn't impact the handled state.
updateSelectionForMouseDownDispatchingSelectStart(innerNode, newSelection, granularity);
return false;
}
static inline bool canMouseDownStartSelect(Node* node)
{
if (!node || !node->renderer())
return true;
if (!node->canStartSelection())
return false;
return true;
}
bool EventHandler::handleMousePressEvent(const MouseEventWithHitTestResults& event)
{
TRACE_EVENT0("webkit", "EventHandler::handleMousePressEvent");
// Reset drag state.
dragState().m_dragSrc = nullptr;
cancelFakeMouseMoveEvent();
m_frame->document()->updateLayoutIgnorePendingStylesheets();
if (ScrollView* scrollView = m_frame->view()) {
if (scrollView->isPointInScrollbarCorner(event.event().position()))
return false;
}
bool singleClick = event.event().clickCount() <= 1;
// If we got the event back, that must mean it wasn't prevented,
// so it's allowed to start a drag or selection if it wasn't in a scrollbar.
m_mouseDownMayStartSelect = canMouseDownStartSelect(event.targetNode()) && !event.scrollbar();
m_mouseDownMayStartDrag = singleClick;
m_mouseDownWasSingleClickInSelection = false;
m_mouseDown = event.event();
if (event.isOverWidget() && passWidgetMouseDownEventToWidget(event))
return true;
if (m_frame->document()->isSVGDocument() && m_frame->document()->accessSVGExtensions().zoomAndPanEnabled()) {
if (event.event().shiftKey() && singleClick) {
m_svgPan = true;
m_frame->document()->accessSVGExtensions().startPan(m_frame->view()->windowToContents(event.event().position()));
return true;
}
}
// We don't do this at the start of mouse down handling,
// because we don't want to do it until we know we didn't hit a widget.
if (singleClick)
focusDocumentView();
Node* innerNode = event.targetNode();
m_mousePressNode = innerNode;
m_dragStartPos = event.event().position();
bool swallowEvent = false;
m_mousePressed = true;
m_selectionInitiationState = HaveNotStartedSelection;
if (event.event().clickCount() == 2)
swallowEvent = handleMousePressEventDoubleClick(event);
else if (event.event().clickCount() >= 3)
swallowEvent = handleMousePressEventTripleClick(event);
else
swallowEvent = handleMousePressEventSingleClick(event);
m_mouseDownMayStartAutoscroll = m_mouseDownMayStartSelect
|| (m_mousePressNode && m_mousePressNode->renderBox() && m_mousePressNode->renderBox()->canBeProgramaticallyScrolled());
return swallowEvent;
}
bool EventHandler::handleMouseDraggedEvent(const MouseEventWithHitTestResults& event)
{
TRACE_EVENT0("webkit", "EventHandler::handleMouseDraggedEvent");
if (!m_mousePressed)
return false;
if (handleDrag(event, ShouldCheckDragHysteresis))
return true;
Node* targetNode = event.targetNode();
if (event.event().button() != LeftButton || !targetNode)
return false;
RenderObject* renderer = targetNode->renderer();
if (!renderer) {
Node* parent = NodeRenderingTraversal::parent(targetNode);
if (!parent)
return false;
renderer = parent->renderer();
if (!renderer || !renderer->isListBox())
return false;
}
m_mouseDownMayStartDrag = false;
if (m_mouseDownMayStartAutoscroll && !panScrollInProgress()) {
if (AutoscrollController* controller = autoscrollController()) {
controller->startAutoscrollForSelection(renderer);
m_mouseDownMayStartAutoscroll = false;
}
}
if (m_selectionInitiationState != ExtendedSelection) {
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
HitTestResult result(m_mouseDownPos);
m_frame->document()->renderView()->hitTest(request, result);
updateSelectionForMouseDrag(result);
}
updateSelectionForMouseDrag(event.hitTestResult());
return true;
}
void EventHandler::updateSelectionForMouseDrag()
{
FrameView* view = m_frame->view();
if (!view)
return;
RenderView* renderer = m_frame->contentRenderer();
if (!renderer)
return;
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::Move | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
renderer->hitTest(request, result);
updateSelectionForMouseDrag(result);
}
void EventHandler::updateSelectionForMouseDrag(const HitTestResult& hitTestResult)
{
if (!m_mouseDownMayStartSelect)
return;
Node* target = hitTestResult.targetNode();
if (!target)
return;
VisiblePosition targetPosition = m_frame->selection().selection().visiblePositionRespectingEditingBoundary(hitTestResult.localPoint(), target);
// Don't modify the selection if we're not on a node.
if (targetPosition.isNull())
return;
// Restart the selection if this is the first mouse move. This work is usually
// done in handleMousePressEvent, but not if the mouse press was on an existing selection.
VisibleSelection newSelection = m_frame->selection().selection();
// Special case to limit selection to the containing block for SVG text.
// FIXME: Isn't there a better non-SVG-specific way to do this?
if (Node* selectionBaseNode = newSelection.base().deprecatedNode())
if (RenderObject* selectionBaseRenderer = selectionBaseNode->renderer())
if (selectionBaseRenderer->isSVGText())
if (target->renderer()->containingBlock() != selectionBaseRenderer->containingBlock())
return;
if (m_selectionInitiationState == HaveNotStartedSelection && !dispatchSelectStart(target))
return;
if (m_selectionInitiationState != ExtendedSelection) {
// Always extend selection here because it's caused by a mouse drag
m_selectionInitiationState = ExtendedSelection;
newSelection = VisibleSelection(targetPosition);
}
if (RuntimeEnabledFeatures::userSelectAllEnabled()) {
Node* rootUserSelectAllForMousePressNode = Position::rootUserSelectAllForNode(m_mousePressNode.get());
if (rootUserSelectAllForMousePressNode && rootUserSelectAllForMousePressNode == Position::rootUserSelectAllForNode(target)) {
newSelection.setBase(positionBeforeNode(rootUserSelectAllForMousePressNode).upstream(CanCrossEditingBoundary));
newSelection.setExtent(positionAfterNode(rootUserSelectAllForMousePressNode).downstream(CanCrossEditingBoundary));
} else {
// Reset base for user select all when base is inside user-select-all area and extent < base.
if (rootUserSelectAllForMousePressNode && comparePositions(target->renderer()->positionForPoint(hitTestResult.localPoint()), m_mousePressNode->renderer()->positionForPoint(m_dragStartPos)) < 0)
newSelection.setBase(positionAfterNode(rootUserSelectAllForMousePressNode).downstream(CanCrossEditingBoundary));
Node* rootUserSelectAllForTarget = Position::rootUserSelectAllForNode(target);
if (rootUserSelectAllForTarget && m_mousePressNode->renderer() && comparePositions(target->renderer()->positionForPoint(hitTestResult.localPoint()), m_mousePressNode->renderer()->positionForPoint(m_dragStartPos)) < 0)
newSelection.setExtent(positionBeforeNode(rootUserSelectAllForTarget).upstream(CanCrossEditingBoundary));
else if (rootUserSelectAllForTarget && m_mousePressNode->renderer())
newSelection.setExtent(positionAfterNode(rootUserSelectAllForTarget).downstream(CanCrossEditingBoundary));
else
newSelection.setExtent(targetPosition);
}
} else {
newSelection.setExtent(targetPosition);
}
if (m_frame->selection().granularity() != CharacterGranularity)
newSelection.expandUsingGranularity(m_frame->selection().granularity());
m_frame->selection().setNonDirectionalSelectionIfNeeded(newSelection, m_frame->selection().granularity(),
FrameSelection::AdjustEndpointsAtBidiBoundary);
}
bool EventHandler::handleMouseReleaseEvent(const MouseEventWithHitTestResults& event)
{
AutoscrollController* controller = autoscrollController();
if (controller && controller->autoscrollInProgress())
stopAutoscroll();
// Used to prevent mouseMoveEvent from initiating a drag before
// the mouse is pressed again.
m_mousePressed = false;
m_capturesDragging = false;
m_mouseDownMayStartDrag = false;
m_mouseDownMayStartSelect = false;
m_mouseDownMayStartAutoscroll = false;
m_mouseDownWasInSubframe = false;
bool handled = false;
// Clear the selection if the mouse didn't move after the last mouse
// press and it's not a context menu click. We do this so when clicking
// on the selection, the selection goes away. However, if we are
// editing, place the caret.
if (m_mouseDownWasSingleClickInSelection && m_selectionInitiationState != ExtendedSelection
&& m_dragStartPos == event.event().position()
&& m_frame->selection().isRange()
&& event.event().button() != RightButton) {
VisibleSelection newSelection;
Node* node = event.targetNode();
bool caretBrowsing = m_frame->settings() && m_frame->settings()->caretBrowsingEnabled();
if (node && node->renderer() && (caretBrowsing || node->rendererIsEditable())) {
VisiblePosition pos = VisiblePosition(node->renderer()->positionForPoint(event.localPoint()));
newSelection = VisibleSelection(pos);
}
setSelectionIfNeeded(m_frame->selection(), newSelection);
handled = true;
}
m_frame->selection().notifyRendererOfSelectionChange(UserTriggered);
m_frame->selection().selectFrameElementInParentIfFullySelected();
if (event.event().button() == MiddleButton && !event.isOverLink()) {
// Ignore handled, since we want to paste to where the caret was placed anyway.
handled = handlePasteGlobalSelection(event.event()) || handled;
}
return handled;
}
#if OS(WIN)
void EventHandler::startPanScrolling(RenderObject* renderer)
{
if (!renderer->isBox())
return;
AutoscrollController* controller = autoscrollController();
if (!controller)
return;
controller->startPanScrolling(toRenderBox(renderer), lastKnownMousePosition());
invalidateClick();
}
#endif // OS(WIN)
AutoscrollController* EventHandler::autoscrollController() const
{
if (Page* page = m_frame->page())
return &page->autoscrollController();
return 0;
}
bool EventHandler::panScrollInProgress() const
{
return autoscrollController() && autoscrollController()->panScrollInProgress();
}
HitTestResult EventHandler::hitTestResultAtPoint(const LayoutPoint& point, HitTestRequest::HitTestRequestType hitType, const LayoutSize& padding)
{
TRACE_EVENT0("webkit", "EventHandler::hitTestResultAtPoint");
// We always send hitTestResultAtPoint to the main frame if we have one,
// otherwise we might hit areas that are obscured by higher frames.
if (Page* page = m_frame->page()) {
LocalFrame* mainFrame = page->mainFrame()->isLocalFrame() ? page->deprecatedLocalMainFrame() : 0;
if (mainFrame && m_frame != mainFrame) {
FrameView* frameView = m_frame->view();
FrameView* mainView = mainFrame->view();
if (frameView && mainView) {
IntPoint mainFramePoint = mainView->rootViewToContents(frameView->contentsToRootView(roundedIntPoint(point)));
return mainFrame->eventHandler().hitTestResultAtPoint(mainFramePoint, hitType, padding);
}
}
}
HitTestResult result(point, padding.height(), padding.width(), padding.height(), padding.width());
// RenderView::hitTest causes a layout, and we don't want to hit that until the first
// layout because until then, there is nothing shown on the screen - the user can't
// have intentionally clicked on something belonging to this page. Furthermore,
// mousemove events before the first layout should not lead to a premature layout()
// happening, which could show a flash of white.
// See also the similar code in Document::prepareMouseEvent.
if (!m_frame->contentRenderer() || !m_frame->view() || !m_frame->view()->didFirstLayout())
return result;
// hitTestResultAtPoint is specifically used to hitTest into all frames, thus it always allows child frame content.
HitTestRequest request(hitType | HitTestRequest::AllowChildFrameContent);
m_frame->contentRenderer()->hitTest(request, result);
if (!request.readOnly())
m_frame->document()->updateHoverActiveState(request, result.innerElement());
if (request.disallowsShadowContent())
result.setToNodesInDocumentTreeScope();
return result;
}
void EventHandler::stopAutoscroll()
{
if (AutoscrollController* controller = autoscrollController())
controller->stopAutoscroll();
}
Node* EventHandler::mousePressNode() const
{
return m_mousePressNode.get();
}
bool EventHandler::scroll(ScrollDirection direction, ScrollGranularity granularity, Node* startNode, Node** stopNode, float delta, IntPoint absolutePoint)
{
if (!delta)
return false;
Node* node = startNode;
if (!node)
node = m_frame->document()->focusedElement();
if (!node)
node = m_mousePressNode.get();
if (!node || !node->renderer())
return false;
RenderBox* curBox = node->renderer()->enclosingBox();
while (curBox && !curBox->isRenderView()) {
ScrollDirection physicalDirection = toPhysicalDirection(
direction, curBox->isHorizontalWritingMode(), curBox->style()->isFlippedBlocksWritingMode());
// If we're at the stopNode, we should try to scroll it but we shouldn't bubble past it
bool shouldStopBubbling = stopNode && *stopNode && curBox->node() == *stopNode;
bool didScroll = curBox->scroll(physicalDirection, granularity, delta);
if (didScroll && stopNode)
*stopNode = curBox->node();
if (didScroll || shouldStopBubbling) {
setFrameWasScrolledByUser();
return true;
}
curBox = curBox->containingBlock();
}
return false;
}
bool EventHandler::bubblingScroll(ScrollDirection direction, ScrollGranularity granularity, Node* startingNode)
{
// The layout needs to be up to date to determine if we can scroll. We may be
// here because of an onLoad event, in which case the final layout hasn't been performed yet.
m_frame->document()->updateLayoutIgnorePendingStylesheets();
if (scroll(direction, granularity, startingNode))
return true;
LocalFrame* frame = m_frame;
FrameView* view = frame->view();
if (view && view->scroll(direction, granularity))
return true;
Frame* parentFrame = frame->tree().parent();
if (!parentFrame || !parentFrame->isLocalFrame())
return false;
// FIXME: Broken for OOPI.
return toLocalFrame(parentFrame)->eventHandler().bubblingScroll(direction, granularity, m_frame->deprecatedLocalOwner());
}
IntPoint EventHandler::lastKnownMousePosition() const
{
return m_lastKnownMousePosition;
}
static LocalFrame* subframeForTargetNode(Node* node)
{
if (!node)
return 0;
RenderObject* renderer = node->renderer();
if (!renderer || !renderer->isWidget())
return 0;
// FIXME: This explicit check is needed only until RemoteFrames have RemoteFrameViews.
if (isHTMLFrameElementBase(node) && toHTMLFrameElementBase(node)->contentFrame() && toHTMLFrameElementBase(node)->contentFrame()->isRemoteFrameTemporary())
return 0;
Widget* widget = toRenderWidget(renderer)->widget();
if (!widget || !widget->isFrameView())
return 0;
return &toFrameView(widget)->frame();
}
static LocalFrame* subframeForHitTestResult(const MouseEventWithHitTestResults& hitTestResult)
{
if (!hitTestResult.isOverWidget())
return 0;
return subframeForTargetNode(hitTestResult.targetNode());
}
static bool isSubmitImage(Node* node)
{
return isHTMLInputElement(node) && toHTMLInputElement(node)->isImageButton();
}
bool EventHandler::useHandCursor(Node* node, bool isOverLink)
{
if (!node)
return false;
return ((isOverLink || isSubmitImage(node)) && !node->rendererIsEditable());
}
void EventHandler::cursorUpdateTimerFired(Timer*)
{
ASSERT(m_frame);
ASSERT(m_frame->document());
updateCursor();
}
void EventHandler::updateCursor()
{
if (m_mousePositionIsUnknown)
return;
FrameView* view = m_frame->view();
if (!view || !view->shouldSetCursor())
return;
RenderView* renderView = view->renderView();
if (!renderView)
return;
m_frame->document()->updateLayout();
HitTestRequest request(HitTestRequest::ReadOnly);
HitTestResult result(view->windowToContents(m_lastKnownMousePosition));
renderView->hitTest(request, result);
OptionalCursor optionalCursor = selectCursor(result);
if (optionalCursor.isCursorChange()) {
m_currentMouseCursor = optionalCursor.cursor();
view->setCursor(m_currentMouseCursor);
}
}
OptionalCursor EventHandler::selectCursor(const HitTestResult& result)
{
if (m_resizeScrollableArea && m_resizeScrollableArea->inResizeMode())
return NoCursorChange;
Page* page = m_frame->page();
if (!page)
return NoCursorChange;
#if OS(WIN)
if (panScrollInProgress())
return NoCursorChange;
#endif
Node* node = result.innerPossiblyPseudoNode();
if (!node)
return selectAutoCursor(result, node, iBeamCursor());
RenderObject* renderer = node->renderer();
RenderStyle* style = renderer ? renderer->style() : 0;
if (renderer) {
Cursor overrideCursor;
switch (renderer->getCursor(roundedIntPoint(result.localPoint()), overrideCursor)) {
case SetCursorBasedOnStyle:
break;
case SetCursor:
return overrideCursor;
case DoNotSetCursor:
return NoCursorChange;
}
}
if (style && style->cursors()) {
const CursorList* cursors = style->cursors();
for (unsigned i = 0; i < cursors->size(); ++i) {
StyleImage* styleImage = (*cursors)[i].image();
if (!styleImage)
continue;
ImageResource* cachedImage = styleImage->cachedImage();
if (!cachedImage)
continue;
float scale = styleImage->imageScaleFactor();
// Get hotspot and convert from logical pixels to physical pixels.
IntPoint hotSpot = (*cursors)[i].hotSpot();
hotSpot.scale(scale, scale);
IntSize size = cachedImage->imageForRenderer(renderer)->size();
if (cachedImage->errorOccurred())
continue;
// Limit the size of cursors (in UI pixels) so that they cannot be
// used to cover UI elements in chrome.
size.scale(1 / scale);
if (size.width() > maximumCursorSize || size.height() > maximumCursorSize)
continue;
Image* image = cachedImage->imageForRenderer(renderer);
// Ensure no overflow possible in calculations above.
if (scale < minimumCursorScale)
continue;
return Cursor(image, hotSpot, scale);
}
}
switch (style ? style->cursor() : CURSOR_AUTO) {
case CURSOR_AUTO: {
bool horizontalText = !style || style->isHorizontalWritingMode();
const Cursor& iBeam = horizontalText ? iBeamCursor() : verticalTextCursor();
return selectAutoCursor(result, node, iBeam);
}
case CURSOR_CROSS:
return crossCursor();
case CURSOR_POINTER:
return handCursor();
case CURSOR_MOVE:
return moveCursor();
case CURSOR_ALL_SCROLL:
return moveCursor();
case CURSOR_E_RESIZE:
return eastResizeCursor();
case CURSOR_W_RESIZE:
return westResizeCursor();
case CURSOR_N_RESIZE:
return northResizeCursor();
case CURSOR_S_RESIZE:
return southResizeCursor();
case CURSOR_NE_RESIZE:
return northEastResizeCursor();
case CURSOR_SW_RESIZE:
return southWestResizeCursor();
case CURSOR_NW_RESIZE:
return northWestResizeCursor();
case CURSOR_SE_RESIZE:
return southEastResizeCursor();
case CURSOR_NS_RESIZE:
return northSouthResizeCursor();
case CURSOR_EW_RESIZE:
return eastWestResizeCursor();
case CURSOR_NESW_RESIZE:
return northEastSouthWestResizeCursor();
case CURSOR_NWSE_RESIZE:
return northWestSouthEastResizeCursor();
case CURSOR_COL_RESIZE:
return columnResizeCursor();
case CURSOR_ROW_RESIZE:
return rowResizeCursor();
case CURSOR_TEXT:
return iBeamCursor();
case CURSOR_WAIT:
return waitCursor();
case CURSOR_HELP:
return helpCursor();
case CURSOR_VERTICAL_TEXT:
return verticalTextCursor();
case CURSOR_CELL:
return cellCursor();
case CURSOR_CONTEXT_MENU:
return contextMenuCursor();
case CURSOR_PROGRESS:
return progressCursor();
case CURSOR_NO_DROP:
return noDropCursor();
case CURSOR_ALIAS:
return aliasCursor();
case CURSOR_COPY:
return copyCursor();
case CURSOR_NONE:
return noneCursor();
case CURSOR_NOT_ALLOWED:
return notAllowedCursor();
case CURSOR_DEFAULT:
return pointerCursor();
case CURSOR_ZOOM_IN:
return zoomInCursor();
case CURSOR_ZOOM_OUT:
return zoomOutCursor();
case CURSOR_WEBKIT_GRAB:
return grabCursor();
case CURSOR_WEBKIT_GRABBING:
return grabbingCursor();
}
return pointerCursor();
}
OptionalCursor EventHandler::selectAutoCursor(const HitTestResult& result, Node* node, const Cursor& iBeam)
{
bool editable = (node && node->rendererIsEditable());
if (useHandCursor(node, result.isOverLink()))
return handCursor();
bool inResizer = false;
RenderObject* renderer = node ? node->renderer() : 0;
if (renderer && m_frame->view()) {
RenderLayer* layer = renderer->enclosingLayer();
inResizer = layer->scrollableArea() && layer->scrollableArea()->isPointInResizeControl(result.roundedPointInMainFrame(), ResizerForPointer);
}
// During selection, use an I-beam no matter what we're over.
// If a drag may be starting or we're capturing mouse events for a particular node, don't treat this as a selection.
if (m_mousePressed && m_mouseDownMayStartSelect
&& !m_mouseDownMayStartDrag
&& m_frame->selection().isCaretOrRange()
&& !m_capturingMouseEventsNode) {
return iBeam;
}
if ((editable || (renderer && renderer->isText() && node->canStartSelection())) && !inResizer && !result.scrollbar())
return iBeam;
return pointerCursor();
}
static LayoutPoint documentPointForWindowPoint(LocalFrame* frame, const IntPoint& windowPoint)
{
FrameView* view = frame->view();
// FIXME: Is it really OK to use the wrong coordinates here when view is 0?
// Historically the code would just crash; this is clearly no worse than that.
return view ? view->windowToContents(windowPoint) : windowPoint;
}
bool EventHandler::handleMousePressEvent(const PlatformMouseEvent& mouseEvent)
{
TRACE_EVENT0("webkit", "EventHandler::handleMousePressEvent");
RefPtr protector(m_frame->view());
UserGestureIndicator gestureIndicator(DefinitelyProcessingUserGesture);
m_frame->localFrameRoot()->eventHandler().m_lastMouseDownUserGestureToken = gestureIndicator.currentToken();
cancelFakeMouseMoveEvent();
if (m_eventHandlerWillResetCapturingMouseEventsNode)
m_capturingMouseEventsNode = nullptr;
m_mousePressed = true;
m_capturesDragging = true;
setLastKnownMousePosition(mouseEvent);
m_mouseDownTimestamp = mouseEvent.timestamp();
m_mouseDownMayStartDrag = false;
m_mouseDownMayStartSelect = false;
m_mouseDownMayStartAutoscroll = false;
if (FrameView* view = m_frame->view())
m_mouseDownPos = view->windowToContents(mouseEvent.position());
else {
invalidateClick();
return false;
}
m_mouseDownWasInSubframe = false;
HitTestRequest::HitTestRequestType hitType = HitTestRequest::Active | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent;
if (mouseEvent.fromTouch())
hitType |= HitTestRequest::ReadOnly;
HitTestRequest request(hitType);
// Save the document point we generate in case the window coordinate is invalidated by what happens
// when we dispatch the event.
LayoutPoint documentPoint = documentPointForWindowPoint(m_frame, mouseEvent.position());
MouseEventWithHitTestResults mev = m_frame->document()->prepareMouseEvent(request, documentPoint, mouseEvent);
if (!mev.targetNode()) {
invalidateClick();
return false;
}
m_mousePressNode = mev.targetNode();
RefPtr subframe = subframeForHitTestResult(mev);
if (subframe && passMousePressEventToSubframe(mev, subframe.get())) {
// Start capturing future events for this frame. We only do this if we didn't clear
// the m_mousePressed flag, which may happen if an AppKit widget entered a modal event loop.
m_capturesDragging = subframe->eventHandler().capturesDragging();
if (m_mousePressed && m_capturesDragging) {
m_capturingMouseEventsNode = mev.targetNode();
m_eventHandlerWillResetCapturingMouseEventsNode = true;
}
invalidateClick();
return true;
}
#if OS(WIN)
// We store whether pan scrolling is in progress before calling stopAutoscroll()
// because it will set m_autoscrollType to NoAutoscroll on return.
bool isPanScrollInProgress = panScrollInProgress();
stopAutoscroll();
if (isPanScrollInProgress) {
// We invalidate the click when exiting pan scrolling so that we don't inadvertently navigate
// away from the current page (e.g. the click was on a hyperlink). See .
invalidateClick();
return true;
}
#endif
m_clickCount = mouseEvent.clickCount();
m_clickNode = mev.targetNode()->isTextNode() ? NodeRenderingTraversal::parent(mev.targetNode()) : mev.targetNode();
if (FrameView* view = m_frame->view()) {
RenderLayer* layer = mev.targetNode()->renderer() ? mev.targetNode()->renderer()->enclosingLayer() : 0;
IntPoint p = view->windowToContents(mouseEvent.position());
if (layer && layer->scrollableArea() && layer->scrollableArea()->isPointInResizeControl(p, ResizerForPointer)) {
m_resizeScrollableArea = layer->scrollableArea();
m_resizeScrollableArea->setInResizeMode(true);
m_offsetFromResizeCorner = m_resizeScrollableArea->offsetFromResizeCorner(p);
invalidateClick();
return true;
}
}
m_frame->selection().setCaretBlinkingSuspended(true);
bool swallowEvent = !dispatchMouseEvent(EventTypeNames::mousedown, mev.targetNode(), m_clickCount, mouseEvent, true);
swallowEvent = swallowEvent || !handleMouseFocus(mouseEvent);
m_capturesDragging = !swallowEvent || mev.scrollbar();
// If the hit testing originally determined the event was in a scrollbar, refetch the MouseEventWithHitTestResults
// in case the scrollbar widget was destroyed when the mouse event was handled.
if (mev.scrollbar()) {
const bool wasLastScrollBar = mev.scrollbar() == m_lastScrollbarUnderMouse.get();
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
mev = m_frame->document()->prepareMouseEvent(request, documentPoint, mouseEvent);
if (wasLastScrollBar && mev.scrollbar() != m_lastScrollbarUnderMouse.get())
m_lastScrollbarUnderMouse = nullptr;
}
if (swallowEvent) {
// scrollbars should get events anyway, even disabled controls might be scrollable
passMousePressEventToScrollbar(mev);
} else {
if (shouldRefetchEventTarget(mev)) {
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
mev = m_frame->document()->prepareMouseEvent(request, documentPoint, mouseEvent);
}
if (passMousePressEventToScrollbar(mev))
swallowEvent = true;
else
swallowEvent = handleMousePressEvent(mev);
}
return swallowEvent;
}
static RenderLayer* layerForNode(Node* node)
{
if (!node)
return 0;
RenderObject* renderer = node->renderer();
if (!renderer)
return 0;
RenderLayer* layer = renderer->enclosingLayer();
if (!layer)
return 0;
return layer;
}
ScrollableArea* EventHandler::associatedScrollableArea(const RenderLayer* layer) const
{
if (RenderLayerScrollableArea* scrollableArea = layer->scrollableArea()) {
if (scrollableArea->scrollsOverflow())
return scrollableArea;
}
return 0;
}
bool EventHandler::handleMouseMoveEvent(const PlatformMouseEvent& event)
{
TRACE_EVENT0("webkit", "EventHandler::handleMouseMoveEvent");
RefPtr protector(m_frame->view());
MaximumDurationTracker maxDurationTracker(&m_maxMouseMovedDuration);
HitTestResult hoveredNode = HitTestResult(LayoutPoint());
bool result = handleMouseMoveOrLeaveEvent(event, &hoveredNode);
Page* page = m_frame->page();
if (!page)
return result;
if (RenderLayer* layer = layerForNode(hoveredNode.innerNode())) {
if (ScrollableArea* layerScrollableArea = associatedScrollableArea(layer))
layerScrollableArea->mouseMovedInContentArea();
}
if (FrameView* frameView = m_frame->view())
frameView->mouseMovedInContentArea();
hoveredNode.setToShadowHostIfInUserAgentShadowRoot();
page->chrome().mouseDidMoveOverElement(hoveredNode, event.modifierFlags());
page->chrome().setToolTip(hoveredNode);
return result;
}
void EventHandler::handleMouseLeaveEvent(const PlatformMouseEvent& event)
{
TRACE_EVENT0("webkit", "EventHandler::handleMouseLeaveEvent");
RefPtr protector(m_frame->view());
handleMouseMoveOrLeaveEvent(event);
}
bool EventHandler::handleMouseMoveOrLeaveEvent(const PlatformMouseEvent& mouseEvent, HitTestResult* hoveredNode, bool onlyUpdateScrollbars)
{
ASSERT(m_frame);
ASSERT(m_frame->view());
setLastKnownMousePosition(mouseEvent);
if (m_hoverTimer.isActive())
m_hoverTimer.stop();
m_cursorUpdateTimer.stop();
cancelFakeMouseMoveEvent();
if (m_svgPan) {
m_frame->document()->accessSVGExtensions().updatePan(m_frame->view()->windowToContents(m_lastKnownMousePosition));
return true;
}
if (m_frameSetBeingResized)
return !dispatchMouseEvent(EventTypeNames::mousemove, m_frameSetBeingResized.get(), 0, mouseEvent, false);
// Send events right to a scrollbar if the mouse is pressed.
if (m_lastScrollbarUnderMouse && m_mousePressed) {
m_lastScrollbarUnderMouse->mouseMoved(mouseEvent);
return true;
}
HitTestRequest::HitTestRequestType hitType = HitTestRequest::Move | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent;
if (mouseEvent.fromTouch())
hitType |= HitTestRequest::ReadOnly;
if (m_mousePressed)
hitType |= HitTestRequest::Active;
else if (onlyUpdateScrollbars) {
// Mouse events should be treated as "read-only" if we're updating only scrollbars. This
// means that :hover and :active freeze in the state they were in, rather than updating
// for nodes the mouse moves while the window is not key (which will be the case if
// onlyUpdateScrollbars is true).
hitType |= HitTestRequest::ReadOnly;
}
// Treat any mouse move events as readonly if the user is currently touching the screen.
if (m_touchPressed)
hitType |= HitTestRequest::Active | HitTestRequest::ReadOnly;
HitTestRequest request(hitType);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);
if (hoveredNode)
*hoveredNode = mev.hitTestResult();
Scrollbar* scrollbar = 0;
if (m_resizeScrollableArea && m_resizeScrollableArea->inResizeMode())
m_resizeScrollableArea->resize(mouseEvent, m_offsetFromResizeCorner);
else {
if (FrameView* view = m_frame->view())
scrollbar = view->scrollbarAtPoint(mouseEvent.position());
if (!scrollbar)
scrollbar = mev.scrollbar();
updateLastScrollbarUnderMouse(scrollbar, !m_mousePressed);
if (onlyUpdateScrollbars)
return true;
}
bool swallowEvent = false;
RefPtr newSubframe = m_capturingMouseEventsNode.get() ? subframeForTargetNode(m_capturingMouseEventsNode.get()) : subframeForHitTestResult(mev);
// We want mouseouts to happen first, from the inside out. First send a move event to the last subframe so that it will fire mouseouts.
if (m_lastMouseMoveEventSubframe && m_lastMouseMoveEventSubframe->tree().isDescendantOf(m_frame) && m_lastMouseMoveEventSubframe != newSubframe)
passMouseMoveEventToSubframe(mev, m_lastMouseMoveEventSubframe.get());
if (newSubframe) {
// Update over/out state before passing the event to the subframe.
updateMouseEventTargetNode(mev.targetNode(), mouseEvent, true);
// Event dispatch in updateMouseEventTargetNode may have caused the subframe of the target
// node to be detached from its FrameView, in which case the event should not be passed.
if (newSubframe->view())
swallowEvent |= passMouseMoveEventToSubframe(mev, newSubframe.get(), hoveredNode);
} else {
if (scrollbar && !m_mousePressed)
scrollbar->mouseMoved(mouseEvent); // Handle hover effects on platforms that support visual feedback on scrollbar hovering.
if (FrameView* view = m_frame->view()) {
OptionalCursor optionalCursor = selectCursor(mev.hitTestResult());
if (optionalCursor.isCursorChange()) {
m_currentMouseCursor = optionalCursor.cursor();
view->setCursor(m_currentMouseCursor);
}
}
}
m_lastMouseMoveEventSubframe = newSubframe;
if (swallowEvent)
return true;
swallowEvent = !dispatchMouseEvent(EventTypeNames::mousemove, mev.targetNode(), 0, mouseEvent, true);
if (!swallowEvent)
swallowEvent = handleMouseDraggedEvent(mev);
return swallowEvent;
}
void EventHandler::invalidateClick()
{
m_clickCount = 0;
m_clickNode = nullptr;
}
static Node* parentForClickEvent(const Node& node)
{
// IE doesn't dispatch click events for mousedown/mouseup events across form
// controls.
if (node.isHTMLElement() && toHTMLElement(node).isInteractiveContent())
return 0;
return NodeRenderingTraversal::parent(&node);
}
bool EventHandler::handleMouseReleaseEvent(const PlatformMouseEvent& mouseEvent)
{
TRACE_EVENT0("webkit", "EventHandler::handleMouseReleaseEvent");
RefPtr protector(m_frame->view());
m_frame->selection().setCaretBlinkingSuspended(false);
OwnPtr gestureIndicator;
if (m_frame->localFrameRoot()->eventHandler().m_lastMouseDownUserGestureToken)
gestureIndicator = adoptPtr(new UserGestureIndicator(m_frame->localFrameRoot()->eventHandler().m_lastMouseDownUserGestureToken.release()));
else
gestureIndicator = adoptPtr(new UserGestureIndicator(DefinitelyProcessingUserGesture));
#if OS(WIN)
if (Page* page = m_frame->page())
page->autoscrollController().handleMouseReleaseForPanScrolling(m_frame, mouseEvent);
#endif
m_mousePressed = false;
setLastKnownMousePosition(mouseEvent);
if (m_svgPan) {
m_svgPan = false;
m_frame->document()->accessSVGExtensions().updatePan(m_frame->view()->windowToContents(m_lastKnownMousePosition));
return true;
}
if (m_frameSetBeingResized)
return !dispatchMouseEvent(EventTypeNames::mouseup, m_frameSetBeingResized.get(), m_clickCount, mouseEvent, false);
if (m_lastScrollbarUnderMouse) {
invalidateClick();
m_lastScrollbarUnderMouse->mouseUp(mouseEvent);
bool setUnder = false;
return !dispatchMouseEvent(EventTypeNames::mouseup, m_lastNodeUnderMouse.get(), m_clickCount, mouseEvent, setUnder);
}
HitTestRequest::HitTestRequestType hitType = HitTestRequest::Release | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent;
if (mouseEvent.fromTouch())
hitType |= HitTestRequest::ReadOnly;
HitTestRequest request(hitType);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseEvent);
LocalFrame* subframe = m_capturingMouseEventsNode.get() ? subframeForTargetNode(m_capturingMouseEventsNode.get()) : subframeForHitTestResult(mev);
if (m_eventHandlerWillResetCapturingMouseEventsNode)
m_capturingMouseEventsNode = nullptr;
if (subframe && passMouseReleaseEventToSubframe(mev, subframe))
return true;
bool swallowMouseUpEvent = !dispatchMouseEvent(EventTypeNames::mouseup, mev.targetNode(), m_clickCount, mouseEvent, false);
bool contextMenuEvent = mouseEvent.button() == RightButton;
#if OS(MACOSX)
// FIXME: The Mac port achieves the same behavior by checking whether the context menu is currently open in WebPage::mouseEvent(). Consider merging the implementations.
if (mouseEvent.button() == LeftButton && mouseEvent.modifiers() & PlatformEvent::CtrlKey)
contextMenuEvent = true;
#endif
bool swallowClickEvent = false;
if (m_clickCount > 0 && !contextMenuEvent && mev.targetNode() && m_clickNode) {
if (Node* clickTargetNode = mev.targetNode()->commonAncestor(*m_clickNode, parentForClickEvent))
swallowClickEvent = !dispatchMouseEvent(EventTypeNames::click, clickTargetNode, m_clickCount, mouseEvent, true);
}
if (m_resizeScrollableArea) {
m_resizeScrollableArea->setInResizeMode(false);
m_resizeScrollableArea = 0;
}
bool swallowMouseReleaseEvent = false;
if (!swallowMouseUpEvent)
swallowMouseReleaseEvent = handleMouseReleaseEvent(mev);
invalidateClick();
return swallowMouseUpEvent || swallowClickEvent || swallowMouseReleaseEvent;
}
bool EventHandler::handlePasteGlobalSelection(const PlatformMouseEvent& mouseEvent)
{
// If the event was a middle click, attempt to copy global selection in after
// the newly set caret position.
//
// This code is called from either the mouse up or mouse down handling. There
// is some debate about when the global selection is pasted:
// xterm: pastes on up.
// GTK: pastes on down.
// Qt: pastes on up.
// Firefox: pastes on up.
// Chromium: pastes on up.
//
// There is something of a webcompat angle to this well, as highlighted by
// crbug.com/14608. Pages can clear text boxes 'onclick' and, if we paste on
// down then the text is pasted just before the onclick handler runs and
// clears the text box. So it's important this happens after the event
// handlers have been fired.
if (mouseEvent.type() != PlatformEvent::MouseReleased)
return false;
if (!m_frame->page())
return false;
Frame* focusFrame = m_frame->page()->focusController().focusedOrMainFrame();
// Do not paste here if the focus was moved somewhere else.
if (m_frame == focusFrame && m_frame->editor().behavior().supportsGlobalSelection())
return m_frame->editor().command("PasteGlobalSelection").execute();
return false;
}
bool EventHandler::dispatchDragEvent(const AtomicString& eventType, Node* dragTarget, const PlatformMouseEvent& event, Clipboard* clipboard)
{
FrameView* view = m_frame->view();
// FIXME: We might want to dispatch a dragleave even if the view is gone.
if (!view)
return false;
RefPtrWillBeRawPtr me = MouseEvent::create(eventType,
true, true, m_frame->document()->domWindow(),
0, event.globalPosition().x(), event.globalPosition().y(), event.position().x(), event.position().y(),
event.movementDelta().x(), event.movementDelta().y(),
event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(),
0, nullptr, clipboard);
dragTarget->dispatchEvent(me.get(), IGNORE_EXCEPTION);
return me->defaultPrevented();
}
static bool targetIsFrame(Node* target, LocalFrame*& frame)
{
if (!isHTMLFrameElementBase(target))
return false;
// Cross-process drag and drop is not yet supported.
if (toHTMLFrameElementBase(target)->contentFrame() && !toHTMLFrameElementBase(target)->contentFrame()->isLocalFrame())
return false;
frame = toLocalFrame(toHTMLFrameElementBase(target)->contentFrame());
return true;
}
static bool findDropZone(Node* target, Clipboard* clipboard)
{
Element* element = target->isElementNode() ? toElement(target) : target->parentElement();
for (; element; element = element->parentElement()) {
bool matched = false;
AtomicString dropZoneStr = element->fastGetAttribute(webkitdropzoneAttr);
if (dropZoneStr.isEmpty())
continue;
dropZoneStr = dropZoneStr.lower();
SpaceSplitString keywords(dropZoneStr, false);
if (keywords.isNull())
continue;
DragOperation dragOperation = DragOperationNone;
for (unsigned i = 0; i < keywords.size(); i++) {
DragOperation op = convertDropZoneOperationToDragOperation(keywords[i]);
if (op != DragOperationNone) {
if (dragOperation == DragOperationNone)
dragOperation = op;
} else
matched = matched || clipboard->hasDropZoneType(keywords[i].string());
if (matched && dragOperation != DragOperationNone)
break;
}
if (matched) {
clipboard->setDropEffect(convertDragOperationToDropZoneOperation(dragOperation));
return true;
}
}
return false;
}
bool EventHandler::updateDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
bool accept = false;
if (!m_frame->view())
return false;
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, event);
// Drag events should never go to text nodes (following IE, and proper mouseover/out dispatch)
RefPtrWillBeRawPtr newTarget = mev.targetNode();
if (newTarget && newTarget->isTextNode())
newTarget = NodeRenderingTraversal::parent(newTarget.get());
if (AutoscrollController* controller = autoscrollController())
controller->updateDragAndDrop(newTarget.get(), event.position(), event.timestamp());
if (m_dragTarget != newTarget) {
// FIXME: this ordering was explicitly chosen to match WinIE. However,
// it is sometimes incorrect when dragging within subframes, as seen with
// LayoutTests/fast/events/drag-in-frames.html.
//
// Moreover, this ordering conforms to section 7.9.4 of the HTML 5 spec. .
LocalFrame* targetFrame;
if (targetIsFrame(newTarget.get(), targetFrame)) {
if (targetFrame)
accept = targetFrame->eventHandler().updateDragAndDrop(event, clipboard);
} else if (newTarget) {
// As per section 7.9.4 of the HTML 5 spec., we must always fire a drag event before firing a dragenter, dragleave, or dragover event.
if (dragState().m_dragSrc) {
// for now we don't care if event handler cancels default behavior, since there is none
dispatchDragSrcEvent(EventTypeNames::drag, event);
}
accept = dispatchDragEvent(EventTypeNames::dragenter, newTarget.get(), event, clipboard);
if (!accept)
accept = findDropZone(newTarget.get(), clipboard);
}
if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
if (targetFrame)
accept = targetFrame->eventHandler().updateDragAndDrop(event, clipboard);
} else if (m_dragTarget)
dispatchDragEvent(EventTypeNames::dragleave, m_dragTarget.get(), event, clipboard);
if (newTarget) {
// We do not explicitly call dispatchDragEvent here because it could ultimately result in the appearance that
// two dragover events fired. So, we mark that we should only fire a dragover event on the next call to this function.
m_shouldOnlyFireDragOverEvent = true;
}
} else {
LocalFrame* targetFrame;
if (targetIsFrame(newTarget.get(), targetFrame)) {
if (targetFrame)
accept = targetFrame->eventHandler().updateDragAndDrop(event, clipboard);
} else if (newTarget) {
// Note, when dealing with sub-frames, we may need to fire only a dragover event as a drag event may have been fired earlier.
if (!m_shouldOnlyFireDragOverEvent && dragState().m_dragSrc) {
// for now we don't care if event handler cancels default behavior, since there is none
dispatchDragSrcEvent(EventTypeNames::drag, event);
}
accept = dispatchDragEvent(EventTypeNames::dragover, newTarget.get(), event, clipboard);
if (!accept)
accept = findDropZone(newTarget.get(), clipboard);
m_shouldOnlyFireDragOverEvent = false;
}
}
m_dragTarget = newTarget;
return accept;
}
void EventHandler::cancelDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
LocalFrame* targetFrame;
if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
if (targetFrame)
targetFrame->eventHandler().cancelDragAndDrop(event, clipboard);
} else if (m_dragTarget.get()) {
if (dragState().m_dragSrc)
dispatchDragSrcEvent(EventTypeNames::drag, event);
dispatchDragEvent(EventTypeNames::dragleave, m_dragTarget.get(), event, clipboard);
}
clearDragState();
}
bool EventHandler::performDragAndDrop(const PlatformMouseEvent& event, Clipboard* clipboard)
{
LocalFrame* targetFrame;
bool preventedDefault = false;
if (targetIsFrame(m_dragTarget.get(), targetFrame)) {
if (targetFrame)
preventedDefault = targetFrame->eventHandler().performDragAndDrop(event, clipboard);
} else if (m_dragTarget.get())
preventedDefault = dispatchDragEvent(EventTypeNames::drop, m_dragTarget.get(), event, clipboard);
clearDragState();
return preventedDefault;
}
void EventHandler::clearDragState()
{
stopAutoscroll();
m_dragTarget = nullptr;
m_capturingMouseEventsNode = nullptr;
m_shouldOnlyFireDragOverEvent = false;
}
void EventHandler::setCapturingMouseEventsNode(PassRefPtrWillBeRawPtr n)
{
m_capturingMouseEventsNode = n;
m_eventHandlerWillResetCapturingMouseEventsNode = false;
}
MouseEventWithHitTestResults EventHandler::prepareMouseEvent(const HitTestRequest& request, const PlatformMouseEvent& mev)
{
ASSERT(m_frame);
ASSERT(m_frame->document());
return m_frame->document()->prepareMouseEvent(request, documentPointForWindowPoint(m_frame, mev.position()), mev);
}
void EventHandler::updateMouseEventTargetNode(Node* targetNode, const PlatformMouseEvent& mouseEvent, bool fireMouseOverOut)
{
Node* result = targetNode;
// If we're capturing, we always go right to that node.
if (m_capturingMouseEventsNode)
result = m_capturingMouseEventsNode.get();
else {
// If the target node is a text node, dispatch on the parent node - rdar://4196646
if (result && result->isTextNode())
result = NodeRenderingTraversal::parent(result);
}
m_nodeUnderMouse = result;
// Fire mouseout/mouseover if the mouse has shifted to a different node.
if (fireMouseOverOut) {
RenderLayer* layerForLastNode = layerForNode(m_lastNodeUnderMouse.get());
RenderLayer* layerForNodeUnderMouse = layerForNode(m_nodeUnderMouse.get());
Page* page = m_frame->page();
if (m_lastNodeUnderMouse && (!m_nodeUnderMouse || m_nodeUnderMouse->document() != m_frame->document())) {
// The mouse has moved between frames.
if (LocalFrame* frame = m_lastNodeUnderMouse->document().frame()) {
if (FrameView* frameView = frame->view())
frameView->mouseExitedContentArea();
}
} else if (page && (layerForLastNode && (!layerForNodeUnderMouse || layerForNodeUnderMouse != layerForLastNode))) {
// The mouse has moved between layers.
if (ScrollableArea* scrollableAreaForLastNode = associatedScrollableArea(layerForLastNode))
scrollableAreaForLastNode->mouseExitedContentArea();
}
if (m_nodeUnderMouse && (!m_lastNodeUnderMouse || m_lastNodeUnderMouse->document() != m_frame->document())) {
// The mouse has moved between frames.
if (LocalFrame* frame = m_nodeUnderMouse->document().frame()) {
if (FrameView* frameView = frame->view())
frameView->mouseEnteredContentArea();
}
} else if (page && (layerForNodeUnderMouse && (!layerForLastNode || layerForNodeUnderMouse != layerForLastNode))) {
// The mouse has moved between layers.
if (ScrollableArea* scrollableAreaForNodeUnderMouse = associatedScrollableArea(layerForNodeUnderMouse))
scrollableAreaForNodeUnderMouse->mouseEnteredContentArea();
}
if (m_lastNodeUnderMouse && m_lastNodeUnderMouse->document() != m_frame->document()) {
m_lastNodeUnderMouse = nullptr;
m_lastScrollbarUnderMouse = nullptr;
}
if (m_lastNodeUnderMouse != m_nodeUnderMouse) {
// send mouseout event to the old node
if (m_lastNodeUnderMouse)
m_lastNodeUnderMouse->dispatchMouseEvent(mouseEvent, EventTypeNames::mouseout, 0, m_nodeUnderMouse.get());
// send mouseover event to the new node
if (m_nodeUnderMouse)
m_nodeUnderMouse->dispatchMouseEvent(mouseEvent, EventTypeNames::mouseover, 0, m_lastNodeUnderMouse.get());
}
m_lastNodeUnderMouse = m_nodeUnderMouse;
}
}
// The return value means 'continue default handling.'
bool EventHandler::dispatchMouseEvent(const AtomicString& eventType, Node* targetNode, int clickCount, const PlatformMouseEvent& mouseEvent, bool setUnder)
{
updateMouseEventTargetNode(targetNode, mouseEvent, setUnder);
return !m_nodeUnderMouse || m_nodeUnderMouse->dispatchMouseEvent(mouseEvent, eventType, clickCount);
}
// The return value means 'continue default handling.'
bool EventHandler::handleMouseFocus(const PlatformMouseEvent& mouseEvent)
{
// If clicking on a frame scrollbar, do not mess up with content focus.
if (FrameView* view = m_frame->view()) {
if (view->scrollbarAtPoint(mouseEvent.position()))
return true;
}
// The layout needs to be up to date to determine if an element is focusable.
m_frame->document()->updateLayoutIgnorePendingStylesheets();
Element* element = 0;
if (m_nodeUnderMouse)
element = m_nodeUnderMouse->isElementNode() ? toElement(m_nodeUnderMouse) : m_nodeUnderMouse->parentOrShadowHostElement();
for (; element; element = element->parentOrShadowHostElement()) {
if (element->isFocusable() && element->focused())
return true;
if (element->isMouseFocusable())
break;
}
ASSERT(!element || element->isMouseFocusable());
// To fix Can't drag selected ToDo, we don't focus
// a node on mouse down if it's selected and inside a focused node. It will
// be focused if the user does a mouseup over it, however, because the
// mouseup will set a selection inside it, which will call
// FrameSelection::setFocusedNodeIfNeeded.
if (element
&& m_frame->selection().isRange()
&& m_frame->selection().toNormalizedRange()->compareNode(element, IGNORE_EXCEPTION) == Range::NODE_INSIDE
&& element->isDescendantOf(m_frame->document()->focusedElement()))
return true;
// Only change the focus when clicking scrollbars if it can transfered to a
// mouse focusable node.
if (!element && isInsideScrollbar(mouseEvent.position()))
return false;
if (Page* page = m_frame->page()) {
// If focus shift is blocked, we eat the event. Note we should never
// clear swallowEvent if the page already set it (e.g., by canceling
// default behavior).
if (element) {
if (!page->focusController().setFocusedElement(element, m_frame, FocusTypeMouse))
return false;
} else {
// We call setFocusedElement even with !element in order to blur
// current focus element when a link is clicked; this is expected by
// some sites that rely on onChange handlers running from form
// fields before the button click is processed.
if (!page->focusController().setFocusedElement(0, m_frame))
return false;
}
}
return true;
}
bool EventHandler::isInsideScrollbar(const IntPoint& windowPoint) const
{
if (RenderView* renderView = m_frame->contentRenderer()) {
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
HitTestResult result(windowPoint);
renderView->hitTest(request, result);
return result.scrollbar();
}
return false;
}
bool EventHandler::handleWheelEvent(const PlatformWheelEvent& event)
{
#define RETURN_WHEEL_EVENT_HANDLED() \
{ \
setFrameWasScrolledByUser(); \
return true; \
}
Document* doc = m_frame->document();
if (!doc->renderView())
return false;
RefPtr protector(m_frame->view());
FrameView* view = m_frame->view();
if (!view)
return false;
LayoutPoint vPoint = view->windowToContents(event.position());
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
HitTestResult result(vPoint);
doc->renderView()->hitTest(request, result);
Node* node = result.innerNode();
// Wheel events should not dispatch to text nodes.
if (node && node->isTextNode())
node = NodeRenderingTraversal::parent(node);
bool isOverWidget;
if (event.useLatchedEventNode()) {
if (!m_latchedWheelEventNode) {
m_latchedWheelEventNode = node;
m_widgetIsLatched = result.isOverWidget();
} else
node = m_latchedWheelEventNode.get();
isOverWidget = m_widgetIsLatched;
} else {
if (m_latchedWheelEventNode)
m_latchedWheelEventNode = nullptr;
if (m_previousWheelScrolledNode)
m_previousWheelScrolledNode = nullptr;
isOverWidget = result.isOverWidget();
}
if (node) {
// Figure out which view to send the event to.
RenderObject* target = node->renderer();
if (isOverWidget && target && target->isWidget()) {
Widget* widget = toRenderWidget(target)->widget();
if (widget && passWheelEventToWidget(event, widget))
RETURN_WHEEL_EVENT_HANDLED();
}
if (node && !node->dispatchWheelEvent(event))
RETURN_WHEEL_EVENT_HANDLED();
}
// We do another check on the frame view because the event handler can run JS which results in the frame getting destroyed.
view = m_frame->view();
if (!view || !view->wheelEvent(event))
return false;
RETURN_WHEEL_EVENT_HANDLED();
#undef RETURN_WHEEL_EVENT_HANDLED
}
void EventHandler::defaultWheelEventHandler(Node* startNode, WheelEvent* wheelEvent)
{
if (!startNode || !wheelEvent)
return;
// Ctrl + scrollwheel is reserved for triggering zoom in/out actions in Chromium.
if (wheelEvent->ctrlKey())
return;
Node* stopNode = m_previousWheelScrolledNode.get();
ScrollGranularity granularity = wheelGranularityToScrollGranularity(wheelEvent->deltaMode());
// Break up into two scrolls if we need to. Diagonal movement on
// a MacBook pro is an example of a 2-dimensional mouse wheel event (where both deltaX and deltaY can be set).
if (scroll(ScrollRight, granularity, startNode, &stopNode, wheelEvent->deltaX(), roundedIntPoint(wheelEvent->absoluteLocation())))
wheelEvent->setDefaultHandled();
if (scroll(ScrollDown, granularity, startNode, &stopNode, wheelEvent->deltaY(), roundedIntPoint(wheelEvent->absoluteLocation())))
wheelEvent->setDefaultHandled();
if (!m_latchedWheelEventNode)
m_previousWheelScrolledNode = stopNode;
}
bool EventHandler::handleGestureShowPress()
{
m_lastShowPressTimestamp = WTF::currentTime();
FrameView* view = m_frame->view();
if (!view)
return false;
if (ScrollAnimator* scrollAnimator = view->existingScrollAnimator())
scrollAnimator->cancelAnimations();
const FrameView::ScrollableAreaSet* areas = view->scrollableAreas();
if (!areas)
return false;
for (FrameView::ScrollableAreaSet::const_iterator it = areas->begin(); it != areas->end(); ++it) {
ScrollableArea* sa = *it;
ScrollAnimator* animator = sa->scrollAnimator();
if (animator)
animator->cancelAnimations();
}
return false;
}
bool EventHandler::handleGestureEvent(const PlatformGestureEvent& gestureEvent)
{
IntPoint adjustedPoint = gestureEvent.position();
RefPtr subframe = nullptr;
switch (gestureEvent.type()) {
case PlatformEvent::GestureScrollBegin:
case PlatformEvent::GestureScrollUpdate:
case PlatformEvent::GestureScrollUpdateWithoutPropagation:
case PlatformEvent::GestureScrollEnd:
case PlatformEvent::GestureFlingStart:
// Handle directly in main frame
break;
case PlatformEvent::GestureTap:
case PlatformEvent::GestureTapUnconfirmed:
case PlatformEvent::GestureTapDown:
case PlatformEvent::GestureShowPress:
case PlatformEvent::GestureTapDownCancel:
case PlatformEvent::GestureTwoFingerTap:
case PlatformEvent::GestureLongPress:
case PlatformEvent::GestureLongTap:
case PlatformEvent::GesturePinchBegin:
case PlatformEvent::GesturePinchEnd:
case PlatformEvent::GesturePinchUpdate:
adjustGesturePosition(gestureEvent, adjustedPoint);
subframe = getSubFrameForGestureEvent(adjustedPoint, gestureEvent);
if (subframe)
return subframe->eventHandler().handleGestureEvent(gestureEvent);
break;
default:
ASSERT_NOT_REACHED();
}
RefPtrWillBeRawPtr eventTarget = nullptr;
RefPtr scrollbar;
if (gestureEvent.type() == PlatformEvent::GestureScrollEnd
|| gestureEvent.type() == PlatformEvent::GestureScrollUpdate
|| gestureEvent.type() == PlatformEvent::GestureScrollUpdateWithoutPropagation
|| gestureEvent.type() == PlatformEvent::GestureFlingStart) {
scrollbar = m_scrollbarHandlingScrollGesture.get();
eventTarget = m_scrollGestureHandlingNode.get();
}
HitTestRequest::HitTestRequestType hitType = HitTestRequest::TouchEvent;
double activeInterval = 0;
bool shouldKeepActiveForMinInterval = false;
if (gestureEvent.type() == PlatformEvent::GestureShowPress
|| gestureEvent.type() == PlatformEvent::GestureTapUnconfirmed) {
hitType |= HitTestRequest::Active;
} else if (gestureEvent.type() == PlatformEvent::GestureTapDownCancel) {
hitType |= HitTestRequest::Release;
// A TapDownCancel received when no element is active shouldn't really be changing hover state.
if (!m_frame->document()->activeHoverElement())
hitType |= HitTestRequest::ReadOnly;
} else if (gestureEvent.type() == PlatformEvent::GestureTap) {
hitType |= HitTestRequest::Release;
// If the Tap is received very shortly after ShowPress, we want to
// delay clearing of the active state so that it's visible to the user
// for at least a couple of frames.
activeInterval = WTF::currentTime() - m_lastShowPressTimestamp;
shouldKeepActiveForMinInterval = m_lastShowPressTimestamp && activeInterval < minimumActiveInterval;
if (shouldKeepActiveForMinInterval)
hitType |= HitTestRequest::ReadOnly;
}
else
hitType |= HitTestRequest::Active | HitTestRequest::ReadOnly;
if ((!scrollbar && !eventTarget) || !(hitType & HitTestRequest::ReadOnly)) {
IntPoint hitTestPoint = m_frame->view()->windowToContents(adjustedPoint);
HitTestResult result = hitTestResultAtPoint(hitTestPoint, hitType | HitTestRequest::AllowFrameScrollbars);
if (shouldKeepActiveForMinInterval) {
m_lastDeferredTapElement = result.innerElement();
m_activeIntervalTimer.startOneShot(minimumActiveInterval - activeInterval, FROM_HERE);
}
eventTarget = result.targetNode();
if (!scrollbar) {
FrameView* view = m_frame->view();
scrollbar = view ? view->scrollbarAtPoint(gestureEvent.position()) : 0;
}
if (!scrollbar)
scrollbar = result.scrollbar();
}
if (scrollbar) {
bool eventSwallowed = scrollbar->gestureEvent(gestureEvent);
if (gestureEvent.type() == PlatformEvent::GestureTapDown && eventSwallowed) {
m_scrollbarHandlingScrollGesture = scrollbar;
} else if (gestureEvent.type() == PlatformEvent::GestureScrollEnd
|| gestureEvent.type() == PlatformEvent::GestureFlingStart
|| !eventSwallowed) {
m_scrollbarHandlingScrollGesture = nullptr;
}
if (eventSwallowed)
return true;
}
if (eventTarget) {
bool eventSwallowed = false;
if (handleScrollGestureOnResizer(eventTarget.get(), gestureEvent))
eventSwallowed = true;
else
eventSwallowed = eventTarget->dispatchGestureEvent(gestureEvent);
if (gestureEvent.type() == PlatformEvent::GestureScrollBegin || gestureEvent.type() == PlatformEvent::GestureScrollEnd) {
if (eventSwallowed)
m_scrollGestureHandlingNode = eventTarget;
}
if (eventSwallowed)
return true;
}
// FIXME: A more general scroll system (https://bugs.webkit.org/show_bug.cgi?id=80596) will
// eliminate the need for this.
TemporaryChange baseEventType(m_baseEventType, gestureEvent.type());
switch (gestureEvent.type()) {
case PlatformEvent::GestureScrollBegin:
return handleGestureScrollBegin(gestureEvent);
case PlatformEvent::GestureScrollUpdate:
case PlatformEvent::GestureScrollUpdateWithoutPropagation:
return handleGestureScrollUpdate(gestureEvent);
case PlatformEvent::GestureScrollEnd:
return handleGestureScrollEnd(gestureEvent);
case PlatformEvent::GestureTap:
return handleGestureTap(gestureEvent, adjustedPoint);
case PlatformEvent::GestureShowPress:
return handleGestureShowPress();
case PlatformEvent::GestureLongPress:
return handleGestureLongPress(gestureEvent, adjustedPoint);
case PlatformEvent::GestureLongTap:
return handleGestureLongTap(gestureEvent, adjustedPoint);
case PlatformEvent::GestureTwoFingerTap:
return handleGestureTwoFingerTap(gestureEvent, adjustedPoint);
case PlatformEvent::GestureTapDown:
case PlatformEvent::GesturePinchBegin:
case PlatformEvent::GesturePinchEnd:
case PlatformEvent::GesturePinchUpdate:
case PlatformEvent::GestureTapDownCancel:
case PlatformEvent::GestureTapUnconfirmed:
case PlatformEvent::GestureFlingStart:
break;
default:
ASSERT_NOT_REACHED();
}
return false;
}
bool EventHandler::handleGestureTap(const PlatformGestureEvent& gestureEvent, const IntPoint& adjustedPoint)
{
// FIXME: Refactor this code to not hit test multiple times. We use the adjusted position to ensure that the correct node is targeted by the later redundant hit tests.
unsigned modifierFlags = 0;
if (gestureEvent.altKey())
modifierFlags |= PlatformEvent::AltKey;
if (gestureEvent.ctrlKey())
modifierFlags |= PlatformEvent::CtrlKey;
if (gestureEvent.metaKey())
modifierFlags |= PlatformEvent::MetaKey;
if (gestureEvent.shiftKey())
modifierFlags |= PlatformEvent::ShiftKey;
PlatformEvent::Modifiers modifiers = static_cast(modifierFlags);
PlatformMouseEvent fakeMouseMove(adjustedPoint, gestureEvent.globalPosition(),
NoButton, PlatformEvent::MouseMoved, /* clickCount */ 0,
modifiers, PlatformMouseEvent::FromTouch, gestureEvent.timestamp());
handleMouseMoveEvent(fakeMouseMove);
bool defaultPrevented = false;
PlatformMouseEvent fakeMouseDown(adjustedPoint, gestureEvent.globalPosition(),
LeftButton, PlatformEvent::MousePressed, gestureEvent.tapCount(),
modifiers, PlatformMouseEvent::FromTouch, gestureEvent.timestamp());
defaultPrevented |= handleMousePressEvent(fakeMouseDown);
PlatformMouseEvent fakeMouseUp(adjustedPoint, gestureEvent.globalPosition(),
LeftButton, PlatformEvent::MouseReleased, gestureEvent.tapCount(),
modifiers, PlatformMouseEvent::FromTouch, gestureEvent.timestamp());
defaultPrevented |= handleMouseReleaseEvent(fakeMouseUp);
return defaultPrevented;
}
bool EventHandler::handleGestureLongPress(const PlatformGestureEvent& gestureEvent, const IntPoint& adjustedPoint)
{
m_longTapShouldInvokeContextMenu = false;
if (m_frame->settings() && m_frame->settings()->touchDragDropEnabled() && m_frame->view()) {
PlatformMouseEvent mouseDownEvent(adjustedPoint, gestureEvent.globalPosition(), LeftButton, PlatformEvent::MousePressed, 1,
gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey(), WTF::currentTime());
m_mouseDown = mouseDownEvent;
PlatformMouseEvent mouseDragEvent(adjustedPoint, gestureEvent.globalPosition(), LeftButton, PlatformEvent::MouseMoved, 1,
gestureEvent.shiftKey(), gestureEvent.ctrlKey(), gestureEvent.altKey(), gestureEvent.metaKey(), WTF::currentTime());
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
MouseEventWithHitTestResults mev = prepareMouseEvent(request, mouseDragEvent);
m_didStartDrag = false;
m_mouseDownMayStartDrag = true;
dragState().m_dragSrc = nullptr;
m_mouseDownPos = m_frame->view()->windowToContents(mouseDragEvent.position());
RefPtr protector(m_frame->view());
handleDrag(mev, DontCheckDragHysteresis);
if (m_didStartDrag) {
m_longTapShouldInvokeContextMenu = true;
return true;
}
}
#if OS(ANDROID)
bool shouldLongPressSelectWord = true;
#else
bool shouldLongPressSelectWord = m_frame->settings() && m_frame->settings()->touchEditingEnabled();
#endif
if (shouldLongPressSelectWord) {
IntPoint hitTestPoint = m_frame->view()->windowToContents(gestureEvent.position());
HitTestResult result = hitTestResultAtPoint(hitTestPoint);
Node* innerNode = result.targetNode();
if (!result.isLiveLink() && innerNode && (innerNode->isContentEditable() || innerNode->isTextNode())) {
selectClosestWordFromHitTestResult(result, DontAppendTrailingWhitespace);
if (m_frame->selection().isRange()) {
focusDocumentView();
return true;
}
}
}
return sendContextMenuEventForGesture(gestureEvent);
}
bool EventHandler::handleGestureLongTap(const PlatformGestureEvent& gestureEvent, const IntPoint& adjustedPoint)
{
#if !OS(ANDROID)
if (m_longTapShouldInvokeContextMenu) {
m_longTapShouldInvokeContextMenu = false;
return sendContextMenuEventForGesture(gestureEvent);
}
#endif
return false;
}
bool EventHandler::handleScrollGestureOnResizer(Node* eventTarget, const PlatformGestureEvent& gestureEvent) {
if (gestureEvent.type() == PlatformEvent::GestureScrollBegin) {
RenderLayer* layer = eventTarget->renderer() ? eventTarget->renderer()->enclosingLayer() : 0;
IntPoint p = m_frame->view()->windowToContents(gestureEvent.position());
if (layer && layer->scrollableArea() && layer->scrollableArea()->isPointInResizeControl(p, ResizerForTouch)) {
m_resizeScrollableArea = layer->scrollableArea();
m_resizeScrollableArea->setInResizeMode(true);
m_offsetFromResizeCorner = m_resizeScrollableArea->offsetFromResizeCorner(p);
return true;
}
} else if (gestureEvent.type() == PlatformEvent::GestureScrollUpdate ||
gestureEvent.type() == PlatformEvent::GestureScrollUpdateWithoutPropagation) {
if (m_resizeScrollableArea && m_resizeScrollableArea->inResizeMode()) {
m_resizeScrollableArea->resize(gestureEvent, m_offsetFromResizeCorner);
return true;
}
} else if (gestureEvent.type() == PlatformEvent::GestureScrollEnd) {
if (m_resizeScrollableArea && m_resizeScrollableArea->inResizeMode()) {
m_resizeScrollableArea->setInResizeMode(false);
m_resizeScrollableArea = 0;
return false;
}
}
return false;
}
bool EventHandler::handleGestureTwoFingerTap(const PlatformGestureEvent& gestureEvent, const IntPoint& adjustedPoint)
{
return sendContextMenuEventForGesture(gestureEvent);
}
bool EventHandler::passGestureEventToWidget(const PlatformGestureEvent& gestureEvent, Widget* widget)
{
if (!widget)
return false;
if (!widget->isFrameView())
return false;
return toFrameView(widget)->frame().eventHandler().handleGestureEvent(gestureEvent);
}
bool EventHandler::passGestureEventToWidgetIfPossible(const PlatformGestureEvent& gestureEvent, RenderObject* renderer)
{
if (m_lastHitTestResultOverWidget && renderer && renderer->isWidget()) {
Widget* widget = toRenderWidget(renderer)->widget();
return widget && passGestureEventToWidget(gestureEvent, widget);
}
return false;
}
bool EventHandler::handleGestureScrollEnd(const PlatformGestureEvent& gestureEvent) {
RefPtrWillBeRawPtr node = m_scrollGestureHandlingNode;
clearGestureScrollNodes();
if (node)
passGestureEventToWidgetIfPossible(gestureEvent, node->renderer());
return false;
}
bool EventHandler::handleGestureScrollBegin(const PlatformGestureEvent& gestureEvent)
{
Document* document = m_frame->document();
if (!document->renderView())
return false;
FrameView* view = m_frame->view();
if (!view)
return false;
LayoutPoint viewPoint = view->windowToContents(gestureEvent.position());
HitTestRequest request(HitTestRequest::ReadOnly | HitTestRequest::ConfusingAndOftenMisusedDisallowShadowContent);
HitTestResult result(viewPoint);
document->renderView()->hitTest(request, result);
m_lastHitTestResultOverWidget = result.isOverWidget();
m_scrollGestureHandlingNode = result.innerNode();
m_previousGestureScrolledNode = nullptr;
// If there's no renderer on the node, send the event to the nearest ancestor with a renderer.
// Needed for